<template>
  <van-tabbar v-model="active" route>
      <!-- $route.meta.num -->
    <van-tabbar-item to="/home" icon="home-o">首页</van-tabbar-item>
    <van-tabbar-item to="/topic" icon="label-o">专题</van-tabbar-item>
    <van-tabbar-item to="/category" icon="apps-o">分类</van-tabbar-item>
    <van-tabbar-item to="/cart" icon="cart-o">购物车</van-tabbar-item>
    <van-tabbar-item to="/user" icon="user-circle-o">我的</van-tabbar-item>
  </van-tabbar>
</template>

<script>
export default {
  data() {
    return {
      // active: 0,
    };
  },
  computed: {
    active: {
      //因为刷新active会被重置 我们通过计算属性 this.$route.path来判断是否是当前的路径来改变active
      get() {
        switch (this.$route.path) {
          case "/home":
            return 0;
          case "/topic":
            return 1;
          case "/category":
            return 2;
          case "/cart":
            return 3;
          case "/user":
            return 4;
          default:
            break;
        }
      },
      set() {},
    },
  },
};
</script>

<style lang="less" scoped></style>
